WO2018221003A1

WO2018221003A1 - Tightening torque managing tool and combination of tightening torque managing tool and fastening tool

Info

Publication number: WO2018221003A1
Application number: PCT/JP2018/014589
Authority: WO
Inventors: 龍太小林; 榎本　勝己
Original assignee: 日本クロージャー株式会社
Priority date: 2017-05-30
Filing date: 2018-04-05
Publication date: 2018-12-06
Also published as: TWI752227B; RU2762174C2; RU2019136785A3; TW201901048A; RU2019136785A

Abstract

This tightening torque managing tool (2) includes a fastening tool accommodation part (4) and a tightening torque applying part (6) which are integrally formed from a synthetic resin. The fastening tool accommodation part (4) is provided with an accommodation hole (8) having an open free end, the inner circumferential surface of the accommodation hole (8) has a shape in which a recessed section (16) is formed in a middle portion of each of the side surfaces (15) of a regular polyhedral inner peripheral surface corresponding to a torque-applying regular polyhedral outer peripheral surface of the fastening tool, and an obtuse angle is formed between the bottom surface (16a) of the recessed section (16) and an upstream surface (16b) positioned on the upstream side from the perspective of the tightening rotation direction. On the side surfaces (15), a holding protrusion part configured from a rib (21) extending in the axial direction of the accommodation hole (8) for example is installed in a portion (15b) positioned on the upstream side of the recessed section (16) from the perspective of the tightening rotation direction.

Description

Tightening torque management tool and combination of tightening torque management tool and fastener

The present invention relates to a tightening torque management tool for tightening a fastener such as a nut or a bolt with a required torque, and a combination of the tightening torque management tool and the fastener.

For example, in the installation of sound insulation walls on highways, the installation of ceiling walls such as tunnels, or the installation of various parts in various buildings, many bolts and nuts are used as is well known. In such fastening, it is important to tighten a nut (usually a locking nut) to the bolt with a relatively large required torque, for example, about 17 to 24 Nm in the case of a hexagonal nut having a nominal diameter M10. It is. Patent Documents 1 and 2 below disclose a tightening torque management tool that can be used when a nut is tightened with respect to a bolt or a bolt is tightened with a required torque. Such a tightening torque management tool includes a fastener housing portion and a tightening torque adding portion that are integrally connected by a connecting portion that is broken by a required torque. The nut or bolt head is stored in the fastener storage portion, and torque is applied to the tightening torque adding portion to tighten the nut to the bolt or the bolt to the nut. When the tightening torque applied to the nut or bolt via the fastening portion storage portion applied to the tightening torque addition portion exceeds a threshold value, the connection portion is broken and the tightening torque addition portion is separated from the fastener storage portion, Thus, the nut is tightened to the bolt or the bolt to the nut with the required torque.

Japanese Patent Laid-Open No. 2001-140832 JP2015-224781A

Thus, the tightening torque management tools disclosed in Patent Documents 1 and 2 need to be formed entirely of a strong metal such as iron, particularly when a relatively large tightening torque is required. Therefore, there is a problem to be solved that the manufacturing cost is high. If it is formed from an appropriate synthetic resin to reduce the manufacturing cost, the connecting portion connecting the fastener storage portion and the tightening torque adding portion is less when the tightening torque applied to the tightening torque adding portion is small. It will be broken.

In order to solve the problems as described above in the tightening torque management tool disclosed in Patent Documents 1 and 2, the present inventors previously described the conventional form in the specification of Japanese Patent Application No. 2016-139152. Proposed an entirely different and unique form of tightening torque management tool. Such a tightening torque management tool includes a fastener housing portion and a tightening torque adding portion integrally formed from synthetic resin. The fastener storage part is formed with a storage hole having a free end opened, and this storage hole is an intermediate part of each side surface of the regular polygon inner peripheral surface corresponding to the torque-added regular polygon outer peripheral surface of the fastener. It is the form which formed the recessed part in. Both side surfaces of the recess, that is, the upstream surface located on the upstream side in the tightening rotation direction and the downstream surface located on the downstream side, extend perpendicular to the side surface. When the tightening torque that is applied to the tightening torque adding portion and transmitted to the fastener via the fastener housing portion exceeds a threshold value, the inner peripheral surface of the housing hole is deformed, and the fastener housing portion is As a result, the fastening torque of the fastener is controlled.

The tightening torque management tool proposed by the present inventors as described above is a tightening torque that starts deformation of the inner peripheral surface of the housing hole even if it is formed from an appropriate synthetic resin such as polycarbonate and acrylonitrile butadiene styrene. Can be set to a sufficiently high value, and therefore it is possible to reduce the manufacturing cost by forming it from an appropriate synthetic resin.

However, according to the experience of the present inventors, it has been found that the tightening torque management tool as described above by the present inventors is not yet fully satisfactory and has the following problems. did. That is, when the inner peripheral surface of the storage hole of the fastener storage portion is deformed and the tightening torque management tool is idled with respect to the fastener, each corner portion of the fastener is formed on the inner peripheral surface of the storage hole. There is a possibility that a fissure collides with the upstream surface of each recessed portion, and a crack is generated from the boundary between the bottom surface and the upstream surface of the recessed portion to the outer peripheral surface of the fastener housing portion, and the broken pieces are scattered as dust. This is particularly noticeable when tightening using an electric tool such as an electric torque drive.

Furthermore, according to the experience of the present inventors, it has been found that the tightening torque management tool proposed by the present inventors has the following problems. That is, the tightening torque management tool made of synthetic resin can be molded sufficiently accurately by injection molding or compression molding, and the manufacturing tolerance can be sufficiently reduced. On the other hand, as is well known to those skilled in the art, the manufacturing tolerances of commonly sold ordinary fasteners, i.e., ordinary nuts or bolts, are relatively large. Therefore, in particular, when a nut or bolt head is press-fitted into a storage hole formed in a fastener storage portion of a tightening torque management tool and the tightening torque management tool and the fastener are combined and provided to the market, (1 ) If the nut or bolt head is excessively large with respect to the storage hole, a large force is required to press-fit the nut or bolt head into the storage hole, and a large stress is generated in the fastener storage part. Then, when the nut or bolt is actually tightened to the bolt or nut, the fastener storage part of the tightening torque management tool tends to be broken. (2) On the other hand, the head of the nut or bolt with respect to the storage hole If it is too small, the nut or bolt head is stored in the storage hole by a fine force, but there is little possibility that the nut or bolt head will fall out of the storage hole due to vibration during transportation. There.

The present invention has been made in view of the above-mentioned facts, and its main technical problem is to further improve the tightening torque management tool as previously described by the present inventors and the like, and to provide a fastener storage portion. Each corner of the outer peripheral surface of the fastener is formed in the inner peripheral surface of the storage hole when the inner peripheral surface of the storage hole is deformed and the tightening torque management tool is idled with respect to the fastener. To provide a new and improved tightening torque management tool capable of avoiding cracks as much as possible even when violently colliding with the upstream surface of the same, and also such tightening torque management tool and fastener And providing a new and improved combination.

Another technical problem of the present invention is to further improve the tightening torque management tool as previously proposed by the present inventors, and to store the fastener due to a relatively large manufacturing tolerance of the fastener. To provide a new and improved tightening torque management tool in which it is possible to avoid, as much as possible, that the force required when the fastener is stored in the storage hole of the part is excessive or small; and It is to provide a new and improved combination of such tightening torque management tools and fasteners.

As a result of intensive studies and experiments, the present inventors have found that the bottom surface and the upstream surface (the side surface located on the upstream side in the tightening rotation direction) of each recess formed in the storage hole of the fastener storage portion. It has been found that the main technical problem can be achieved by forming an obtuse angle.

That is, according to the first aspect of the present invention, the tightening torque management tool for achieving the main technical problem includes a fastener storage portion and a tightening torque adding portion integrally formed from synthetic resin,
A storage hole having a free end opened is formed in the fastener storage portion, and the inner peripheral surface of the storage hole is a regular polygon inner peripheral surface corresponding to the torque-added regular polygon outer peripheral surface of the fastener. It is a form in which a recess is formed in the middle part of the side surface, and an obtuse angle is formed between the bottom surface of the recess and the upstream surface located on the upstream side in the tightening rotation direction,
When the tightening torque applied to the tightening torque adding portion and transmitted to the fastener via the fastener storage portion exceeds a threshold value, the inner peripheral surface of the storage hole is deformed and the fastening to the fastener is performed. The tool storage part is idled, and thus the tightening torque of the fastener is managed.
A tightening torque management tool is provided.

Preferably, the upstream surface of the recess extends from the side surface to the outside in an inclined manner in the tightening rotation direction. It is preferable that the bottom surface of the recess and the upstream surface are smoothly connected via an arcuate boundary surface. The torque-added regular polygonal outer peripheral surface is advantageously a regular hexagon. It is desirable that the downstream surface located on the downstream side in the tightening rotation direction of each of the recesses extends perpendicularly to the side surface. The outer peripheral surface of the tightening torque adding portion is preferably a regular polygon corresponding to the torque adding regular polygon outer peripheral surface of the fastener. It is preferable that a holding protrusion is disposed on a portion of the side surface of the regular polygonal inner peripheral surface that is located on the upstream side of the recess when viewed in the tightening rotation direction. Preferably, the holding protrusion is a rib extending in the axial direction of the storage hole. The protruding height of the rib is preferably 0.1 to 0.5 mm, and the circumferential width of the rib is preferably 0.1 to 0.5 mm. Preferably, the cross-sectional shape of the protruding end portion of the rib is a semicircular shape.

According to the second aspect of the present invention, the tightening torque as described above provided in the first aspect of the present invention is a combination of a tightening torque management tool and a fastener that achieve the main technical problem. A combination of a management tool and a fastener at least partially housed in the storage hole of the tightening torque management tool is provided. The regular polygon inner peripheral surface defined by the side surface of the storage hole of the tightening torque management tool is smaller than the torque-added regular polygon outer peripheral surface of the fastener, and the fastener is press-fitted into the storage hole. Is preferred. The fastener may be a hex nut.

Furthermore, as a result of diligent studies and experiments, the present inventors have found that the concave portion of the side surface of the regular polygon inner peripheral surface corresponding to the regular polygon inner peripheral surface defining the storage hole is viewed in the tightening rotation direction. It has been found that the above-mentioned other technical problems can be achieved by disposing the holding protrusion in the portion located on the upstream side.

That is, according to the third aspect of the present invention, the tightening torque management tool that achieves the other technical problem includes a fastener storage portion and a tightening torque adding portion that are integrally formed from synthetic resin. ,
A storage hole having a free end opened is formed in the fastener storage portion, and the inner peripheral surface of the storage hole is a regular polygon inner peripheral surface corresponding to the torque-added regular polygon outer peripheral surface of the fastener. It is a form in which a recess is formed in the middle part of the side surface,
A holding projection is disposed on a portion located on the upstream side of the concave portion on the side surface of the inner peripheral surface of the regular polygon as viewed in the tightening rotation direction,
When the tightening torque applied to the tightening torque adding portion and transmitted to the fastener via the fastener storage portion exceeds a threshold value, the inner peripheral surface of the storage hole is deformed and the fastening to the fastener is performed. The tool storage part is idled, and thus the tightening torque of the fastener is managed.
A tightening torque management tool is provided.

Preferably, the holding protrusion is a rib extending in the axial direction of the storage hole. The protruding height of the rib is preferably 0.1 to 0.5 mm, and the circumferential width of the rib is preferably 0.1 to 0.5 mm. Preferably, the cross-sectional shape of the protruding end portion of the rib is a semicircular shape. Preferably, the torque-added regular polygonal outer peripheral surface is a regular hexagonal shape, and the holding projection is preferably disposed at a portion located on the upstream side of the recess in each of the six side surfaces. The outer peripheral surface of the tightening torque adding portion is preferably a regular polygon corresponding to the torque adding regular polygon outer peripheral surface of the fastener.

According to a fourth aspect of the present invention, there is provided a tightening torque management tool provided by the third aspect of the present invention as a combination of a tightening torque management tool and a fastener that solves the other technical problems described above. A combination with a fastener at least partially housed in the storage hole of the tightening torque management tool is provided. The fastener is preferably press-fitted into the storage hole. The fastener may be a hex nut.

In the tightening torque management tool and the combination of the tightening torque management tool and the fastener provided by the first and second aspects of the present invention, the tightening torque management tool is formed of a synthetic resin, and therefore compared. Despite being able to be manufactured inexpensively, the tightening torque can be sufficiently increased, and the recess formed in the storage hole disposed in the fastener storage portion of the tightening torque management tool In each of these, since the bottom surface and the upstream surface form an obtuse angle, when the inner peripheral surface of the storage hole of the fastener storage portion is deformed and the tightening torque management tool is idled with respect to the fastener, It is avoided as much as possible that a crack is generated even if each corner portion of the outer peripheral surface of the fastener violently collides with the upstream surface of each concave portion formed in the inner peripheral surface of the storage hole.

In the tightening torque management tool and the combination of the tightening torque management tool and the fastener provided by the third and fourth aspects of the present invention, the tightening torque management tool is formed from a synthetic resin, and therefore compared. In spite of being able to manufacture at a reasonable cost, the tightening torque can be sufficiently increased. Furthermore, when the fastener is press-fitted into the storage hole of the fastener storage portion, a relatively large manufacturing tolerance of the fastener is held on the upstream side of the recess when viewed in the tightening rotation direction on the side surface. It is compensated by the elastic deformation and / or plastic deformation of the protruding portion, and it is avoided as much as possible that the force required for press-fitting becomes excessively large or small.

The slope view which looked at suitable embodiment of the tightening torque management tool comprised according to this invention from the upper direction. The slope view which looked at the clamping torque management tool shown in FIG. 1 from the downward direction. The front view which shows a part of cross-section of the clamping torque management tool shown in FIG. The top view of the clamping torque management tool shown in FIG. The bottom view of the tightening torque management tool shown in FIG. The front view which shows a part of combination of the tightening torque management tool shown in FIG. 1, and the nut which is a typical example of a fastener in a cross section. Sectional drawing of the combination shown in FIG. FIG. 7 is a cross-sectional view illustrating a state in which the tightening torque of the nut exceeds the threshold value and the tightening torque management tool idles with respect to the nut in the combination illustrated in FIG. The slope view similar to FIG. 2 which shows other embodiment of the clamping torque management tool comprised according to this invention. FIG. 10 is a bottom view of the tightening torque management tool shown in FIG. 9. Sectional drawing similar to FIG. 7 of the combination of the tightening torque management tool shown in FIG. 9 and the nut which is a typical example of a fastener. Sectional drawing similar to FIG.7 and FIG.11 which shows other embodiment of the clamping torque management tool comprised according to this invention.

Hereinafter, a preferred embodiment of a tightening torque management tool constructed according to the present invention and a combination of such embodiment and a nut as a typical example of a fastener will be described in further detail.

Referring to FIGS. 1 to 3, the tightening torque management tool generally designated by reference numeral 2 is an appropriate synthetic resin, preferably a relatively high strength synthetic resin such as polycarbonate or acrylonitrile butadiene styrene (ABS), Are integrally formed by injection molding or compression molding. The tightening torque management tool 2 includes a fastener storage portion 4 constituting the substantially lower half portion and a tightening torque adding portion 6 constituting the substantially upper half portion.

Referring to FIGS. 4 and 5 together with FIGS. 1 to 3, the fastener storage portion 4 has a cylindrical shape as a whole, and a storage hole 8 having a free end, that is, a lower end is formed. The annular lower surface 10 of the fastener storage portion 4 is flat, and similarly, the annular upper surface 12 is also flat and extends parallel to the annular lower surface 10. The outer peripheral surface 14 of the fastener storage part 4 is cylindrical.

The inner peripheral surface of the storage hole 8 has a configuration in which a recess 16 is formed in the middle of each side surface 15 of the virtual regular polygon inner peripheral surface corresponding to the torque-added regular polygon outer peripheral surface of the fastener to be stored. is important. In the illustrated embodiment, as will be described later, the fastener is a hexagon nut, and therefore the torque-added regular polygon outer peripheral surface of the fastener is a regular hexagon, and the virtual regular polygon inner peripheral surface (indicated by a two-dot chain line in FIG. 5). The inner peripheral surface shown is also a regular hexagon. Each of the recesses 16 has both a bottom surface 16a and both side surfaces, that is, an upstream surface 16b positioned on the upstream side in the tightening rotation direction (clockwise in FIG. 4 and counterclockwise in FIG. 5) and a downstream surface 16c positioned on the downstream side. Have It is important that the angle α formed by the bottom surface 16a and the upstream surface 16b is an obtuse angle that is preferably about 100 to 160 degrees. In the illustrated embodiment, the bottom surface 16a has an arc shape that forms a part of a circle concentric with the outer peripheral surface 14, and the upstream surface 16b is inclined outwardly with respect to the side surface 15 in the tightening rotation direction. It is then extended. It is preferable that the bottom surface 16a and the upstream surface 16b are smoothly connected via an arcuate boundary surface 16d. On the other hand, the downstream surface 16 c extends perpendicular to the side surface 15. In the tightening rotation direction, the circumferential length L1 of the side surface 15a downstream of the concave portion 16 is advantageously longer than the circumferential length L2 of the side surface 15b upstream of the concave portion 16 (in this case) As will be clearly understood from the following description, the threshold value of the tightening torque is defined by the deformation of the side surface downstream of the recess 16). As understood by referring to FIG. 3, the lower end portion of the inner peripheral surface of the storage hole 8 opened in the annular lower surface 10 of the fastener storage portion 4 is chamfered. In the illustrated embodiment, the fastener storage portion 4 is also formed with a communication hole 18 continuing from the upper end of the storage hole 8. As clearly understood by referring to FIG. 5, the cross-sectional shape of the communication hole 18 is circular, and its diameter is somewhat smaller than the diameter of the circle inscribed in the virtual regular hexagon in the storage hole 8. An annular shoulder surface 20 facing downward is defined at the boundary between the hole 8 and the communication hole 18.

The description continues with reference to FIG. 1 to FIG. 4. The tightening torque adding portion 6 extending upward from the annular upper surface 12 of the fastener storage portion 4 is also generally cylindrical and has a through hole extending in the vertical direction. 22. As clearly understood from FIG. 3, the through hole 22 communicates with the storage hole 8 through the communication hole 18. The cross-sectional shape of the through hole 22 is circular, and its diameter is smaller than the diameter of the communication hole 18. An annular shoulder surface 24 facing downward is defined at the boundary between the through hole 22 and the communication hole 18. ing. It is preferable that the outer peripheral surface 26 and the upper surface 28 of the tightening torque adding portion 6 have shapes and dimensions corresponding to the outer peripheral surface and the upper surface of the fastener stored in the fastener storage portion 4, and the illustrated embodiment. , The outer peripheral surface 26 of the tightening torque adding portion 6 is a regular hexagonal shape corresponding to the outer peripheral surface of the hexagon nut (the outer diameter of the tightening torque adding portion 6 is smaller than the outer diameter of the fastener housing portion 4). The main portion of the upper surface 28 is flat, but the outer peripheral portion of the corner is chamfered. The diameter of the through hole 22 of the tightening torque adding portion 6 is somewhat larger than the outer diameter of the shaft portion of the bolt to which the hexagon nut is fastened. As will be further described later, the hexagon nut accommodated in the fastener accommodating portion 4 is When the bolt is fastened, the shaft portion of the bolt passes through the communication hole 18 of the fastener storage portion 4 and the through hole 22 of the tightening torque adding portion 6 as the fastening proceeds.

Although the tightening torque management tool 2 as described above can be circulated on the market by itself, FIGS. 6 and 7 (in FIG. 7, a chamfer at the lower end of the inner peripheral surface of the storage hole 8 is shown for simplification of the drawing. As shown in FIG. 3), it is convenient to distribute it in the market in combination with a fastener. In the embodiment shown in FIGS. 6 and 7, a hex nut 30 is shown as a typical example of a fastener. The outer peripheral surface 32 of the hexagon nut 30 is a regular hexagon and is slightly larger than the virtual regular hexagon related to the storage hole 8 formed in the fastener storage portion 4 (in other words, the fastener in the tightening torque management tool 2). The virtual regular hexagon of the storage hole 8 of the storage unit 4 is set smaller than the outer peripheral surface 32 which is a regular hexagon of the hexagon nut 30). The main portion of the hex nut 30, that is, the portion excluding the lower end, is press-fitted into the storage hole 8 of the fastener storage portion 4, and is formed inside the upper peripheral edge 34 of the hex nut 30. The upper surface of the projection 36 is brought into contact with the annular shoulder surface 24 (in the case where the hexagon nut 30 accommodated in the accommodation hole 8 of the fastener accommodating portion 4 does not have the cylindrical projection 36, the hexagon nut 30, the outer peripheral edge 34 of the upper surface is in contact with the annular shoulder surface 20).

The usage mode of the tightening torque management tool 2 as described above will be described. When the hexagon nut 30 is already combined with the tightening torque management tool 2, the shaft portion 38 of the bolt to be tightened. (FIG. 6). When the hexagon nut 30 is not combined with the tightening torque management tool 2, the hexagon nut 30 temporarily fastened to the bolt is stored in the storage hole 8 formed in the fastener storage portion 4 of the tightening torque management tool 2. (In this case, the virtual regular hexagon of the storage hole 8 is set to be substantially the same size as or slightly larger than the regular hexagonal outer peripheral surface of the hexagon nut 30, and the hexagon nut 30 can be easily inserted into the storage hole 8. It is desirable to be able to store it). Next, an appropriate tightening tool (not shown) is engaged with the outer peripheral surface of the tightening torque applying portion 6 and rotated in the tightening rotation direction (clockwise in FIG. 4 and counterclockwise in FIG. 5). Torque applied from the fastener to the tightening torque adding portion 6 is transmitted to the hexagon nut 30 via the fastener storage portion 4, whereby the hexagon nut 30 is tightened to the shaft portion 38 of the bolt. When the hexagonal nut 30 advances over a relatively long distance in the axial direction with respect to the bolt shaft portion 38, the bolt shaft portion 38 is fastened as shown in FIG. The communication hole 18 formed in the storage part 4 and the through hole 22 formed in the tightening torque adding part 6 are entered, and the communication hole 18 and the through hole 22 are inserted.

When the tightening torque transmitted to the hexagon nut 30 exceeds a predetermined threshold, FIG. 8 (FIG. 8 also shows chamfering at the lower end of the inner peripheral surface of the storage hole 8 for the sake of simplification of the drawing, as in FIG. As shown in the drawing, the inner peripheral surface of the storage hole 8 formed in the fastener storage portion 4, particularly a portion downstream of the recess 16 when viewed in the tightening rotation direction (more specifically, tightening). The region between the boundary region between the upstream side surface 15 and the downstream side surface 15 and the concave portion 16 of the upstream side surface 15 as viewed in the attached rotational direction is directed to the opposite side of the tightening rotational direction. As a result, the tightening torque management tool 2 is idled with respect to the hexagon nut 30, and thus the hexagon nut 30 is fastened to the bolt with the required tightening torque. When the tightening torque management tool 2 starts to idle with respect to the hex nut 30, the upstream surface 16 b of the recess 16 of the storage hole 8 in which the outer peripheral surface corner of the hex nut 30 is formed in the fastener storage part 4. However, in the tightening torque management tool 2 constructed according to the present invention, the bottom surface 16a of the recess 16 and the upstream surface 16b form an obtuse angle. Therefore, it is possible to avoid as much as possible that the force applied to the upstream surface 16b of the recess 16 is buffered or disappeared as appropriate, and that the fastener storage portion 4 is cracked and the fastener storage portion 4 is damaged. After the tightening torque management tool 2 starts to idle relative to the hex nut 30, the tightening torque management tool 2 is sufficiently easily detached from the hex nut 30 by being fastened to the bolt shaft 38 with the required tightening torque. be able to.

9 and 10 illustrate another preferred embodiment of a tightening torque management tool constructed in accordance with the present invention. In the tightening torque management tool 2 illustrated in FIGS. 9, 10, and 11, the recess is seen in the tightening rotation direction (counterclockwise in FIG. 10) on the side surface 15 that defines the inner peripheral surface of the storage hole 8. A holding projection is disposed on the portion 15b located on the upstream side of 16. In the illustrated embodiment, the holding protrusion is formed with a rib 21 extending in the axial direction of the storage hole 8 (direction perpendicular to the paper surface in FIG. 10), preferably substantially parallel to the axial line of the storage hole 8. Yes. In the illustrated embodiment, holding protrusions or ribs 21 are formed in each of the portions 15 b of the six side faces 15. Each of the ribs 21 extends substantially parallel to the axis of the storage hole 8 from the upper end to the vicinity of the lower end of the storage hole 8 as clearly understood by referring to FIGS. 9 and 10. In particular, when the fastener has a nominal diameter M8, M10 or M12, the protruding height H of the rib 21 is about 0.1 to 0.5 mm, and the circumferential width W of each rib 21 is 0.1 to 0.00 mm. It is preferable to be about 5 mm. The cross-sectional shape of the protruding end of the rib 21 is advantageously a semicircular shape as shown in FIG. In the illustrated embodiment, the ribs 21 are formed in all of the portions 15b of the six side faces 15, but if desired, for example, the three side faces 15 located every other one or opposed to the diameter direction. It is also possible to form the ribs 21 only on the portions 15b of the two side faces 15 that are positioned as described above.

The ribs 21 constituting the holding protrusions are not limited to the portion 15b positioned on the upstream side of the recess 16 when viewed in the tightening rotation direction on the side surface 15, but are downstream of the recess 16 when viewed in the tightening rotation direction on the side surface 15. It can also be formed on the side portion 15a. However, when it is formed also in the portion 15a located on the downstream side of the recess 16 when viewed in the tightening rotation direction on the side surface 15, the tightening rotation direction on the side surface 15 when the tightening torque reaches the threshold value as described above. Since the portion 15a located on the downstream side of the concave portion 16 is mainly deformed as seen in FIG. 2, the rib is deformed over its entirety prior to the deformation of the side surface 15, and as a result, the tightening torque reaches the threshold value. The tightening torque management tool 2 tends to be detached from the fastener before. Therefore, it is desirable that the ribs 21 are not disposed in the portion 15a located on the downstream side of the recess 16 when viewed in the tightening rotation direction on the side surface 15.

The configuration other than the rib 21 in the embodiment shown in FIGS. 9 and 10 is substantially the same as the embodiment described with reference to FIGS. 1 to 8, and the same components are denoted by the same reference numerals. is doing.

When the description is continued with reference to FIG. 11 together with FIG. 9 and FIG. 10, the tightening torque management tool 2 as described above can be distributed on the market alone, but FIG. The chamfering at the lower end of the inner peripheral surface of the storage hole 8 is omitted for the sake of simplicity, and the rib 21 is somewhat elastically or plastically deformed by press-fitting a fastener, that is, a hex nut 30 into the storage hole 8. However, it is convenient to circulate in the market in combination with a fastener, as shown in FIG. 2 without overlapping such a deformation, as shown in FIG. As described above, the outer peripheral surface 32 of the hex nut 30 as a typical example of the fastener is a regular hexagon, and when the manufacturing error of the hex nut 30 is sufficiently small, the storage hole 8 formed in the fastener storage portion 4. Is slightly larger than the above-mentioned virtual regular hexagon (in other words, the virtual regular hexagon of the storage hole 8 of the fastener storage part 4 in the tightening torque management tool 2 is set smaller than the outer peripheral surface 32 of the hexagon nut 30 which is a regular hexagon. Have been). The main portion of the hex nut 30, that is, the portion excluding the lower end, is press-fitted into the storage hole 8 of the fastener storage portion 4, and is formed inside the upper peripheral edge 34 of the hex nut 30. The upper surface of the protrusion 36 is brought into contact with the annular shoulder surface 24 (see FIG. 6). The hexagon nut 30 is formed in the housing hole 8 by the rib 21 being pressed against the side surface of the hexagon nut 30 together with the portion 15a located on the downstream side of the recess 16 when viewed in the tightening rotation direction (counterclockwise in FIG. 11). Retained.

As described above, the manufacturing tolerance of the tightening torque management tool 2 that is injection-molded or compression-molded from an appropriate synthetic resin is relatively small, and therefore the manufacturing error of the inner peripheral surface of the storage hole 8 is relatively small. The manufacturing tolerance of the hex nut 30 is relatively large. Therefore, the manufacturing error of the outer peripheral surface of the hex nut 30 is relatively large. However, in the tightening torque management tool 2 shown in FIGS. A relatively large manufacturing error of the outer peripheral surface of the hexagon nut 30 with respect to the inner peripheral surface of the rib 21 is compensated by the elastic or plastic deformation of the rib 21 formed in a required portion of the inner peripheral surface of the storage hole 8. Therefore, it is avoided as much as possible that the force required to press-fit the hexagon bolt 30 into the storage hole 8 is excessive or small.

In the embodiment shown in FIGS. 9, 10, and 11, the holding projecting portion is composed of one rib 21 extending in the axial direction of the storage hole 8, but if desired, the axial direction of the storage hole 8 Or a plurality of ribs extending in the axial direction at intervals in the circumferential direction, one rib extending in the circumferential direction of the storage hole 8, or a plurality of ribs extending in the circumferential direction at intervals in the axial direction or circumferential direction of the storage hole 8, Alternatively, the holding protrusion can be configured from a plurality of protrusions (conveniently circular in cross section) arranged appropriately. FIG. 12 illustrates yet another embodiment of the holding projection. In such an embodiment, the entire surface of the portion 15b located on the upstream side of the recess 16 when viewed in the tightening rotation direction (counterclockwise in FIG. 12) on the side surface 15 (see FIG. 9) is provided. A ridge 40 is formed over the ridge 40, and a groove 42 extending along the ridge 40 is formed on the back side of the ridge 40. In such an embodiment, the raised portion 40 is pressed against the side surface of the hexagon nut 30 together with the portion 15a located on the downstream side of the recess 16 when viewed in the tightening rotation direction (counterclockwise direction in FIG. 12) on the side surface 15. As a result, the hexagon nut 30 is held in the storage hole 8. The relatively large manufacturing error of the outer peripheral surface of the hex nut 30 relative to the inner peripheral surface of the storage hole 8 is compensated by the elastic deformation of the raised portion 40, and the force required to press-fit the hexagon bolt 30 into the storage hole 8 is excessive. Or it becomes possible to avoid becoming too small.

2: Tightening torque management tool 4: Fastener storage portion 6: Tightening torque addition portion 8: Storage hole 15: Side surface 15a: Downstream portion of the side surface 15b: Upstream portion of the side surface 16: Recessed portion 16a: Bottom surface of the recessed portion 16b: upstream surface of recess 16c: downstream surface of recess 18: communication hole 21: rib (holding protrusion)
22: Through hole 30: Hex nut 38: Bolt shaft

Claims

Including a fastener storage portion integrally formed from a synthetic resin and a tightening torque adding portion;
A storage hole having a free end opened is formed in the fastener storage portion, and the inner peripheral surface of the storage hole is a regular polygon inner peripheral surface corresponding to the torque-added regular polygon outer peripheral surface of the fastener. It is a form in which a recess is formed in the middle part of the side surface, and an obtuse angle is formed between the bottom surface of the recess and the upstream surface located on the upstream side in the tightening rotation direction,
When the tightening torque applied to the tightening torque adding portion and transmitted to the fastener via the fastener storage portion exceeds a threshold value, the inner peripheral surface of the storage hole is deformed and the fastening to the fastener is performed. The tool storage part is idled, and thus the tightening torque of the fastener is managed.
A tightening torque management tool characterized by that.
The tightening torque management tool according to claim 1, wherein the upstream surface of the concave portion extends obliquely in the tightening rotation direction outward from the side surface.
The tightening torque management tool according to claim 1 or 2, wherein the bottom surface of the recess and the upstream surface are smoothly connected via an arcuate boundary surface.
The tightening torque management tool according to any one of claims 1 to 3, wherein the outer peripheral surface of the torque-added regular polygon is a regular hexagon.
The tightening torque management tool according to any one of claims 1 to 4, wherein a downstream surface located downstream of each of the recesses in the tightening rotation direction extends perpendicularly to the side surface.
The tightening torque management tool according to any one of claims 1 to 5, wherein the outer peripheral surface of the tightening torque adding portion is a regular polygon corresponding to the torque adding regular polygon outer peripheral surface of the fastener.
The holding protrusion is disposed on a portion of the side surface of the inner peripheral surface of the regular polygon that is located upstream of the recess when viewed in the tightening rotation direction. The tightening torque management tool described.
The tightening torque management tool according to claim 7, wherein the holding protrusion is a rib extending in the axial direction of the storage hole.
The tightening torque management tool according to claim 8, wherein the protruding height of the rib is 0.1 to 0.5 mm, and the circumferential width of the rib is 0.1 to 0.5 mm.
The tightening torque management tool according to claim 8 or 9, wherein the projecting end of the rib has a semicircular cross-sectional shape.
A combination of the tightening torque management tool according to any one of claims 1 to 10 and a fastener at least partially housed in the housing hole of the tightening torque management tool.
The regular polygon inner peripheral surface defined by the side surface of the storage hole of the tightening torque management tool is smaller than the torque-added regular polygon outer peripheral surface of the fastener, and the fastener is press-fitted into the storage hole. The combination according to claim 11.
The combination according to claim 11 or 12, wherein the fastener is a hex nut.
Including a fastener storage portion integrally formed from a synthetic resin and a tightening torque adding portion;
A storage hole having a free end opened is formed in the fastener storage portion, and the inner peripheral surface of the storage hole is a regular polygon inner peripheral surface corresponding to the torque-added regular polygon outer peripheral surface of the fastener. It is a form in which a recess is formed in the middle part of the side surface,
A holding projection is disposed on a portion located on the upstream side of the concave portion on the side surface of the inner peripheral surface of the regular polygon as viewed in the tightening rotation direction,
When the tightening torque applied to the tightening torque adding portion and transmitted to the fastener via the fastener storage portion exceeds a threshold value, the inner peripheral surface of the storage hole is deformed and the fastening to the fastener is performed. The tool storage part is idled, and thus the tightening torque of the fastener is managed.
A tightening torque management tool characterized by that.
The tightening torque management tool according to claim 14, wherein the holding protrusion is a rib extending in the axial direction of the storage hole.
The tightening torque management tool according to claim 15, wherein the protruding height of the rib is 0.1 to 0.5 mm, and the circumferential width of the rib is 0.1 to 0.5 mm.
The tightening torque management tool according to claim 15 or 16, wherein a cross-sectional shape of the protruding end portion of the rib is a semicircular shape.
The torque-added regular polygonal outer peripheral surface is a regular hexagon, and the holding projection is disposed at a portion located on the upstream side of the recess in each of the six side surfaces. The tightening torque management tool according to any one of the above.
The tightening torque management tool according to any one of claims 14 to 18, wherein the outer peripheral surface of the tightening torque adding portion is a regular polygon corresponding to the torque adding regular polygon outer peripheral surface of the fastener.
A combination of the tightening torque management tool according to any one of claims 14 to 19 and a fastening tool at least partially housed in the housing hole of the tightening torque management tool.
The combination according to claim 20, wherein the fastener is press-fitted into the storage hole.
The combination according to claim 20 or 21, wherein the fastener is a hex nut.